Listed below is how many LED's are in fixture.

15" - 6 LED's
24" - 12 LED's
30" - 12 LED's
36" - 18 LED's
48" - 24 LED's

A 48 inch Reef Brite offers 611 PAR which is twice as much as an ATI Blue Plus with a reflector.

With that reading each LED gives just a little over 25 PAR, which is outstanding considering there is no heat factor, the color is great and the price is outstanding!